Convert 3G2 to AMR
Total Audio MP3 Converter converts 3G2 files to AMR format.
The software is an all in one audio converter that supports more than 90 audio
and video files as input, and converts to popular formats such as MP3, WAV, AAC,
M4A, OGG, WMA, and AMR.
Total Audio MP3 Converter also supports batch conversion, and is full compatible
with Vista and Windows
- Free Download
Total Audio MP3 Converter here and then install the software
- Launch Total Audio MP3 Converter
- Choose 3G2 Files
Click "Add Files" to choose 3G2 files and then add them to conversion
Choose one or more 3G2 files you want to convert and then click Open.
- Choose "to AMR"
- Convert 3G2 to AMR
Click button "Convert" to convert all 3G2 files to AMR format.
The software is converting 3G2 files to AMR format.
- Play & Browse
When conversion completes, you could right-click converted item and choose "Play
Destination" to play the destination file; or choose "Browse Destination
Folder" to open Windows Explorer to browse the destination file.
What is 3G2?
3G2 (3GPP2 file format) is a multimedia container format defined by the 3GPP2
for 3G CDMA2000 multimedia services. It is very similar to 3GP file format.
The 3G2 file format can store the same video streams and most of audio streams
used in the 3GP file format. In addition, 3G2 stores audio streams as EVRC, EVRC-B,
EVRC-WB, 13K (QCELP), SMV or VMR-WB, which was specified by 3GPP2 for use in ISO
base media file format. The 3G2 specification also defined some enhancements to
3GPP Timed Text. 3G2 file format does not store Enhanced aacPlus (HE-AAC v2) and
AMR-WB+ audio streams. For the storage of MPEG-4 media (MPEG-4 Part 2, MPEG-4
Part 3 - AAC, MPEG-4 Part 10 - H.264/AVC) in 3G2 files, the 3G2 specification
refers to the MP4 file format and the AVC file format specification, which described
usage of this content in the ISO base media file format. For the storage of H.263
and AMR content 3G2 specification refers to the 3GP file format specification.
What is AMR?
Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech
coding. AMR was adopted as the standard speech codec by 3GPP in October 1998 and
is now widely used in GSM and UMTS. It uses link adaptation to select from one
of eight different bit rates based on link conditions. AMR is also a file format
for storing spoken audio using the AMR codec. Many modern mobile telephone handsets
will allow you to store short recordings in the AMR format. There also exists
another storage format for AMR that is suitable for applications with more advanced
demands on the storage format, like random access or synchronization with video.
This format is the 3GPP-specified 3GP container format based on ISO base media
- Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to
- The AMR codec uses eight source codecs with bit-rates of 12.2, 10.2, 7.95,
7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.
- Generates frame length of 95, 103, 118, 134, 148, 159, 204, or 244 bits for
bit rates 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, or 12.2 kbit/s, respectively
- AMR utilizes Discontinuous Transmission (DTX), with Voice Activity Detection
(VAD) and Comfort Noise Generation (CNG) to reduce bandwidth usage during silence
- Algorithmic delay is 20 ms per frame. For bit-rates of 12.2, there is no 'algorithm'
look-ahead delay. For other rates, look-ahead delay is 5 ms. Note that there is
5 ms 'dummy' look-ahead delay, to allow seamless frame-wise mode switching with
the rest of rates.
- AMR is a hybrid speech coder which uses Algebraic Code Excited Linear Prediction
- The complexity of the algorithm is rated at 5, using a relative scale where
G.711 is 1 and G.729a is 15.
- PSQM testing under ideal conditions yields Mean Opinion Scores of 4.14 for
AMR (12.2 kbit/s), compared to 4.45 for G.711 (u-law)
- PSQM testing under network stress yields Mean Opinion Scores of 3.79 for AMR
(12.2 kbit/s), compared to 4.13 for G.711 (u-law)
Convert 3G2 to AMR Related Topics:
AMV to AMR,
VOB to AMR,
AU to AMR,
AMR to AWB,
FLIC to AMR,
MOD to AMR,
3G2 to AMR,
AMR to AAC,
F4B to AMR,
MPGA to AMR,
VCD to AMR,
TS to AMR,
CD to AMR,
3GP to AMR,
VQF to AMR,
WMD to AMR,
PSX to AMR,
SPX to AMR,
FLAC to AMR,
MJ2 to AMR,
DXA to AMR,
EVO to AMR,
MPE to AMR,
MKV to AMR,
AMR to M4B,
XVID to AMR,
TTA to AMR,
VMD to AMR,
ALAW to AMR,
MKA to AMR,
M4V to AMR,
APE to AMR,
DV to AMR,
FLV to AMR,
WV to AMR,
F4A to AMR,
NSV to AMR,
MPG to AMR,
GXF to AMR